Your gun was made between 1897 and 1901. The history of your gun can be had by contacting the University Archivist, University of Glasgow Business Records Centre, Thy can likely tell you who made the gun for A&N... As for value, It would all depend on the condition, Gauge and configuration.. It could be several hundred dollars for a Birmingham boxlock, non-ejector to $10,000 for London Best Sidelock ejector.. Bushrod